package com.example.demo.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import feign.*;
import feign.codec.Decoder;
import feign.codec.Encoder;
import okhttp3.ConnectionPool;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.FeignAutoConfiguration;
import org.springframework.cloud.openfeign.support.ResponseEntityDecoder;
import org.springframework.cloud.openfeign.support.SpringDecoder;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

@Configuration
@ConditionalOnClass(Feign.class)
@AutoConfigureBefore(FeignAutoConfiguration.class)
public class FeignConfig {

    /**
     * 设置 Eureka Server的访问的用户名和密码
     *
     * @return
     */
    /*@Bean
    public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
        return new BasicAuthRequestInterceptor("admin","admin123");
    }*/

    @Bean
    public okhttp3.OkHttpClient okHttpClient(){
        return new okhttp3.OkHttpClient.Builder()
                .readTimeout(60, TimeUnit.SECONDS)
                .connectTimeout(60, TimeUnit.SECONDS)
                .writeTimeout(120, TimeUnit.SECONDS)
                .connectionPool(new ConnectionPool())
                .build();
    }

    @Bean
    public Feign.Builder feignBuilder() {
        return Feign.builder();
    }

    @Bean
    public Contract feignContract() {
        return new feign.Contract.Default();
    }

    @Bean
    public Logger.Level feignLoggerLevel() {
        return Logger.Level.FULL;
    }

    @Bean
    public Request.Options feignRequestOptions() {
        return new Request.Options(10000, 60000);
    }

    @Bean
    public Retryer feignRetry() {
        return new Retryer.Default();
    }

    @Bean
    public ResponseEntityDecoder feignDecoder() {
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(this.createFastJsonConverter());
        return new ResponseEntityDecoder(new SpringDecoder(objectFactory));
    }

    @Bean
    public SpringEncoder feignEncoder(){
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(this.createFastJsonConverter());
        return new SpringEncoder(objectFactory);
    }

    private HttpMessageConverter createFastJsonConverter() {

        //创建fastJson消息转换器
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

        //升级最新版本需加=============================================================
        List<MediaType> supportedMediaTypes = new ArrayList<>();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
        supportedMediaTypes.add(MediaType.APPLICATION_PROBLEM_JSON_UTF8);
        supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
        supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        supportedMediaTypes.add(MediaType.APPLICATION_PDF);
        supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XML);
        supportedMediaTypes.add(MediaType.IMAGE_GIF);
        supportedMediaTypes.add(MediaType.IMAGE_JPEG);
        supportedMediaTypes.add(MediaType.IMAGE_PNG);
        supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
        supportedMediaTypes.add(MediaType.TEXT_HTML);
        supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
        supportedMediaTypes.add(MediaType.TEXT_PLAIN);
        supportedMediaTypes.add(MediaType.TEXT_XML);

        fastConverter.setSupportedMediaTypes(supportedMediaTypes);

        //创建配置类
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        //修改配置返回内容的过滤
        //WriteNullListAsEmpty  ：List字段如果为null,输出为[],而非null
        //WriteNullStringAsEmpty ： 字符类型字段如果为null,输出为"",而非null
        //DisableCircularReferenceDetect ：消除对同一对象循环引用的问题，默认为false（如果不配置有可能会进入死循环）
        //WriteNullBooleanAsFalse：Boolean字段如果为null,输出为false,而非null
        //WriteMapNullValue：是否输出值为null的字段,默认为false
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue
        );
        fastConverter.setFastJsonConfig(fastJsonConfig);
        return fastConverter;
    }

    //=======================================================

    /*
    @Bean
    public Decoder feignDecoder() {
        HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper());
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(jacksonConverter);
        return new ResponseEntityDecoder(new SpringDecoder(objectFactory));
    }
    @Bean
    public Encoder feignEncoder(){
        HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper());
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(jacksonConverter);
        return new SpringEncoder(objectFactory);
    }
    */

    private ObjectMapper customObjectMapper(){
        ObjectMapper objectMapper = new ObjectMapper();
        //Customize as much as you want
        objectMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        return objectMapper;
    }

}
